Setting up a fish finder on a kayak involves solving three problems that don't exist on motorized boats: mounting the screen at a readable angle from a seated paddling position, powering it without a house battery, and routing the transducer in a way that doesn't add drag or interfere with paddling. Here's the complete guide.
Head Unit Mounting
The viewing angle challenge on a kayak: you're seated low and the unit is typically mounted on the hull in front of you or on a gear track. RAM Mounts' gear track system (most fishing kayaks come with two gear tracks on the gunwales) allows positioning the display unit at any height and angle. A RAM Track Mount + double socket arm + fish finder cradle is the universal kayak solution — positions the screen within easy reading distance without blocking paddling clearance.
Transducer Options for Kayaks
Scupper mount: Easiest installation. A suction-cup or plug-style mount that goes through the scupper hole in sit-on-top kayaks. No drilling. Reversible. Transducer is in the water when the plug is inserted. The most common kayak transducer installation method.
Suction cup mount: Attaches to the hull exterior or to the inside of the hull (for shoot-through on solid kayak hulls). Reversible, no drilling, works on most plastic kayak hull materials.
Through-hull (for hardshell kayaks): Drilled installation for permanent mounting — only appropriate for composite (fiberglass or carbon) kayaks where the hull material supports it.
Power
A 7–12Ah sealed AGM battery runs a 5-inch fish finder for a full day and weighs 5–10 lbs. Mount under the seat, in a small waterproof box, or in the front hatch. Route the power cable to the head unit using a cable raceway or cable clip along the hull interior. Keep connections waterproof with self-sealing connectors or dielectric grease on all terminals.
The most commonly used kayak fish finder — 5-inch CHIRP, down imaging, GPS, and a suction cup transducer option that works with scupper or hull mounting. Compact and power-efficient.